<template>
  <!--banner轮播-->
  <div class="swiper-container" :ref="refName">
    <div class="swiper-wrapper">
      <div
        class="swiper-slide"
        v-for="(banner, index) in bannerList"
        :key="banner.id"
      >
        <img :src="banner.imgUrl" />
      </div>
      <!--  <div class="swiper-slide">
                                <img src="./images/banner2.jpg" />
                            </div>
                            <div class="swiper-slide">
                                <img src="./images/banner3.jpg" />
                            </div>
                            <div class="swiper-slide">
                                <img src="./images/banner4.jpg" />
                            </div> -->
    </div>
    <!-- 如果需要分页器 -->
    <div class="swiper-pagination"></div>

    <!-- 如果需要导航按钮 -->
    <div class="swiper-button-prev"></div>
    <div class="swiper-button-next"></div>
  </div>
</template>
<script>
import Swiper from "swiper";
// import "swiper/css/swiper.min.css";
export default {
  name: "MySwiper",
  props: ["bannerList", "refName"],
  watch: {
    bannerList: {
      immediate: true, //立即执行一次
      //监视数据的变化，此时如果进来，代表数据一定拿到了
      handler() {
        this.$nextTick(() => {
          // DOM 现在更新了
          // `this` 绑定到当前实例
          //初始化swiper，swiper必须在页面的数据结构显示完成后创建才会生效..ref标识可以判断是谁调用此组件从而分别处理
          new Swiper(this.$refs[this.refName], {
            // direction: "vertical", // 垂直切换选项
            loop: true, // 循环模式选项

            // 如果需要分页器
            pagination: {
              el: ".swiper-pagination",
            },

            // 如果需要前进后退按钮
            navigation: {
              nextEl: ".swiper-button-next",
              prevEl: ".swiper-button-prev",
            },

            /* // 如果需要滚动条
            scrollbar: {
              el: ".swiper-scrollbar",
            }, */
          });
        });
      },
    },
  },
};
</script>
<style lang = 'less' scoped>
</style>
